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Kernel: Do not allocate AnonymousVMObject's under spin lock

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Spinlocks guard short regions, with hopefully no other locks being taken
in the process. Violating constraints usually had detrimental effects on
platform stability as well as performance and scalability. Allocating
memory takes it own locks, and can in some cases even allocate new
regions, and thus violates these tenants.

Move the AnonymousVMObject creation outside of the spinlock as
creation does not modify any shared state.
This commit is contained in:
Brian Gianforcaro 2021-05-18 01:45:05 -07:00 committed by Andreas Kling
parent a43bccfc3c
commit 1415b2cfc3
Notes: sideshowbarker 2024-07-18 17:43:58 +09:00 
Author: https://github.com/bgianfo
Commit: https://github.com/SerenityOS/serenity/commit/1415b2cfc30
Pull-request: https://github.com/SerenityOS/serenity/pull/7243
Reviewed-by: https://github.com/awesomekling
1 changed files with 12 additions and 12 deletions
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24
Kernel/VM/MemoryManager.cpp
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@ -470,40 +470,40 @@ OwnPtr<Region> MemoryManager::allocate_contiguous_kernel_region(size_t size, Str
OwnPtr<Region> MemoryManager::allocate_kernel_region(size_t size, String name, Region::Access access, AllocationStrategy strategy, Region::Cacheable cacheable)
{
VERIFY(!(size % PAGE_SIZE));
auto vm_object = AnonymousVMObject::create_with_size(size, strategy);
if (!vm_object)
return {};
ScopedSpinLock lock(s_mm_lock);
auto range = kernel_page_directory().range_allocator().allocate_anywhere(size);
if (!range.has_value())
return {};
auto vmobject = AnonymousVMObject::create_with_size(size, strategy);
if (!vmobject)
return {};
return allocate_kernel_region_with_vmobject(range.value(), vmobject.release_nonnull(), move(name), access, cacheable);
return allocate_kernel_region_with_vmobject(range.value(), vm_object.release_nonnull(), move(name), access, cacheable);
}
OwnPtr<Region> MemoryManager::allocate_kernel_region(PhysicalAddress paddr, size_t size, String name, Region::Access access, Region::Cacheable cacheable)
{
auto vm_object = AnonymousVMObject::create_for_physical_range(paddr, size);
if (!vm_object)
return {};
VERIFY(!(size % PAGE_SIZE));
ScopedSpinLock lock(s_mm_lock);
auto range = kernel_page_directory().range_allocator().allocate_anywhere(size);
if (!range.has_value())
return {};
auto vmobject = AnonymousVMObject::create_for_physical_range(paddr, size);
if (!vmobject)
return {};
return allocate_kernel_region_with_vmobject(range.value(), *vmobject, move(name), access, cacheable);
return allocate_kernel_region_with_vmobject(range.value(), *vm_object, move(name), access, cacheable);
}
OwnPtr<Region> MemoryManager::allocate_kernel_region_identity(PhysicalAddress paddr, size_t size, String name, Region::Access access, Region::Cacheable cacheable)
{
auto vm_object = AnonymousVMObject::create_for_physical_range(paddr, size);
if (!vm_object)
return {};
VERIFY(!(size % PAGE_SIZE));
ScopedSpinLock lock(s_mm_lock);
auto range = kernel_page_directory().identity_range_allocator().allocate_specific(VirtualAddress(paddr.get()), size);
if (!range.has_value())
return {};
auto vmobject = AnonymousVMObject::create_for_physical_range(paddr, size);
if (!vmobject)
return {};
return allocate_kernel_region_with_vmobject(range.value(), *vmobject, move(name), access, cacheable);
return allocate_kernel_region_with_vmobject(range.value(), *vm_object, move(name), access, cacheable);
}
OwnPtr<Region> MemoryManager::allocate_kernel_region_with_vmobject(const Range& range, VMObject& vmobject, String name, Region::Access access, Region::Cacheable cacheable)